function boatLoader(a) {
    var b = a.sort().join('');
    var s = 'abcdefghijklmnopqrstuvwxyz';
    var res = []
    for (c of s) {
        var C = c.toUpperCase();
        if (new RegExp(`${C}{2,}`).test(b)) res.push([C, C]);
        if (new RegExp(`${c}{2,}`).test(b)) res.push([c, c]);
    }
    return res;
}
console.log(0.936202803263 - 0.888075998981)